Fix AuditGuardContract security-theater vulnerability

src/audit-guard/src/lib.rs

@@ -5,7 +5,7 @@
 //! Adheres to Rust safety standards.
 //! Integrates with the existing Audit-Guard API.
 
-use soroban_sdk::{contract, contractimpl, contracterror, Env, BytesN, Address};
+use soroban_sdk::{contract, contractimpl, contracterror, Env, BytesN, Address, Bytes};
 
 #[contracterror]
 #[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
@@ -20,12 +20,20 @@ pub struct AuditGuardContract;
 
 #[contractimpl]
 impl AuditGuardContract {
+    /// Sets the verification status for an author in the contract state.
+    pub fn set_verified(env: Env, author: Address, status: bool) {
+        author.require_auth();
+        env.storage().instance().set(&author, &status);
+    }
+
     /// Verifies the security context against formal verification checks.
     ///
     /// Ensures system resilience by checking authorization and state validation.
-    pub fn verify_context(_env: Env, author: Address, is_verified: bool) -> Result<(), AuditGuardError> {
+    pub fn verify_context(env: Env, author: Address) -> Result<(), AuditGuardError> {
         author.require_auth();
 
+        let is_verified: bool = env.storage().instance().get(&author).unwrap_or(false);
+
         if !is_verified {
             return Err(AuditGuardError::VerificationFailed);
         }
@@ -36,15 +44,68 @@ impl AuditGuardContract {
 
     /// Integrates with the existing Audit module to validate a state transition.
     /// Adheres to Rust safety standards by avoiding unsafe blocks and performing boundary checks.
-    pub fn validate_and_audit(_env: Env, payload: BytesN<32>, _signature: BytesN<64>) -> Result<(), AuditGuardError> {
+    pub fn validate_and_audit(env: Env, public_key: BytesN<32>, payload: Bytes, signature: BytesN<64>) -> Result<(), AuditGuardError> {
         // Implementation of standard security protocol
         if payload.len() == 0 {
             return Err(AuditGuardError::InvalidPayload);
         }
 
-        // Security-sensitive code that passes formal verification checks
-        // (Mock implementation for the issue)
+        // Real signature verification
+        env.crypto().ed25519_verify(&public_key, &payload, &signature);
 
         Ok(())
     }
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use soroban_sdk::{testutils::{Address as _}, Env};
+
+    #[test]
+    fn test_verify_context() {
+        let env = Env::default();
+        env.mock_all_auths();
+        let contract_id = env.register_contract(None, AuditGuardContract);
+        let client = AuditGuardContractClient::new(&env, &contract_id);
+        let author = Address::generate(&env);
+
+        // Not verified initially
+        let res = client.try_verify_context(&author);
+        assert_eq!(res, Err(Ok(AuditGuardError::VerificationFailed)));
+
+        // Set verified
+        client.set_verified(&author, &true);
+
+        // Now succeeds
+        client.verify_context(&author);
+    }
+
+    #[test]
+    #[should_panic]
+    fn test_validate_and_audit_invalid_signature() {
+        let env = Env::default();
+        let contract_id = env.register_contract(None, AuditGuardContract);
+        let client = AuditGuardContractClient::new(&env, &contract_id);
+
+        let public_key = BytesN::from_array(&env, &[0; 32]);
+        let payload = Bytes::from_slice(&env, b"test payload");
+        let invalid_signature = BytesN::from_array(&env, &[0; 64]);
+
+        client.validate_and_audit(&public_key, &payload, &invalid_signature);
+    }
+
+    #[test]
+    fn test_validate_and_audit_empty_payload() {
+        let env = Env::default();
+        let contract_id = env.register_contract(None, AuditGuardContract);
+        let client = AuditGuardContractClient::new(&env, &contract_id);
+
+        let public_key = BytesN::from_array(&env, &[0; 32]);
+        let payload = Bytes::new(&env);
+        let signature = BytesN::from_array(&env, &[0; 64]);
+
+        let res = client.try_validate_and_audit(&public_key, &payload, &signature);
+        assert_eq!(res, Err(Ok(AuditGuardError::InvalidPayload)));
+    }
+}